West County Agency; West County Wastewater District

NPDES permit CA0038539 · Major POTW · effective, expires 2029-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 21 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 32 days after each monitoring period ends (the most common figure among CA permits in EPA's filings — check your permit).

Limits in force (133)

OutfallParameterStatisticLimitMonths
EF01Nitrogen, ammonia total [as N]MO AVG <= 57 mg/L all year
EF01Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L all year
EF01Nitrogen, ammonia total [as N]MO AVG report only all year
EF01Nitrogen, ammonia total [as N]DAILY MX report only all year
EF01Nitrite + Nitrate total [as N]MO AVG report only all year
EF01Nitrite + Nitrate total [as N]DAILY MX report only all year
EF01Nitrite + Nitrate total [as N]MO AVG report only all year
EF01Nitrite + Nitrate total [as N]DAILY MX report only all year
EF01Nitrogen, inorganic totalMO AVG report only all year
EF01Nitrogen, inorganic totalDAILY MX report only all year
EF01Nitrogen, inorganic totalMO AVG report only all year
EF01Nitrogen, inorganic totalDAILY MX report only all year
EF01Phosphorus, total [as P]MO AVG report only all year
EF01Phosphorus, total [as P]DAILY MX report only all year
EF01Phosphorus, total [as P]MO AVG report only all year
EF01Phosphorus, total [as P]DAILY MX report only all year
EF01Cyanide, total [as CN]MO AVG <= 19 ug/L all year
EF01Cyanide, total [as CN]DAILY MX <= 40 ug/L all year
EF01Selenium, total recoverableDAILY MX report only all year
EF01Zinc, total recoverableMO AVG <= 460 ug/L all year
EF01Zinc, total recoverableDAILY MX <= 910 ug/L all year
EF01Copper, total recoverableMO AVG <= 32 ug/L all year
EF01Copper, total recoverableDAILY MX <= 76 ug/L all year
EF01Flow, in conduit or thru treatment plantDAILY AV report only all year
EF01Chlorine, total residual1I <= 1.8 mg/L all year
EF01Flow, totalMO TOTAL report only all year
EF01Polychlorinated biphenyls [PCBs], sum of congenersMO AVG report only all year
EF01Polychlorinated biphenyls [PCBs], sum of congenersDAILY MX report only all year
EF01Polychlorinated biphenyls [PCBs], sum of AroclorsMO AVG <= .012 ug/L all year
EF01Polychlorinated biphenyls [PCBs], sum of AroclorsDAILY MX <= .017 ug/L all year
EF01Mercury, total recoverableMO AVG <= .066 ug/L all year
EF01Mercury, total recoverableWKLY AVG <= .072 ug/L all year
EF01Chromium, hexavalent tot recoverableMO AVG <= 41 ug/L all year
EF01Chromium, hexavalent tot recoverableDAILY MX <= 120 ug/L all year
EF01Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahiaDAILY MX <= 0 pass=0;fail=1 all year
EF01Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahiaMO MED <= 0 pass=0;fail=1 all year
EF01Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahiaDAILY MX <= 50 % effect all year
EF02BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
EF02BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
EF02pHINST MIN >= 6 SU all year
EF02pHINST MAX <= 9 SU all year
EF02Solids, total suspendedMO AVG <= 30 mg/L all year
EF02Solids, total suspendedWKLY AVG <= 45 mg/L all year
EF02Flow, in conduit or thru treatment plantDAILY AV report only all year
EF02Flow, totalMO TOTAL report only all year
EF02EnterococciGEO MEAN <= 290 CFU/100mL all year
EF02Enterococci90TH % <= 1100 CFU/100mL all year
EF02BOD, 5-day, percent removalMO AV MN >= 85 % all year
EF02Solids, suspended percent removalMO AV MN >= 85 % all year
EF03BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
EF03BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
EF03pHINST MIN >= 6 SU all year
EF03pHINST MAX <= 9 SU all year
EF03Solids, total suspendedMO AVG <= 30 mg/L all year
EF03Solids, total suspendedWKLY AVG <= 45 mg/L all year
EF03Flow, in conduit or thru treatment plantDAILY AV report only all year
EF03Flow, totalMO TOTAL report only all year
EF03EnterococciGEO MEAN <= 290 CFU/100mL all year
EF03Enterococci90TH % <= 1100 CFU/100mL all year
EF03BOD, 5-day, percent removalMO AV MN >= 85 % all year
EF03Solids, suspended percent removalMO AV MN >= 85 % all year
EF1BCyanide, total [as CN]MO AVG <= 19 ug/L all year
EF1BCyanide, total [as CN]DAILY MX <= 40 ug/L all year
EF1BZinc, total recoverableMO AVG <= 460 ug/L all year
EF1BZinc, total recoverableDAILY MX <= 910 ug/L all year
EF1BCopper, total recoverableMO AVG <= 32 ug/L all year
EF1BCopper, total recoverableDAILY MX <= 76 ug/L all year
EF1BFlow, in conduit or thru treatment plantDAILY AV report only all year
EF1BChlorine, total residual1I <= 1.8 mg/L all year
EF1BFlow, totalMO TOTAL report only all year
EF1BChromium, hexavalent tot recoverableMO AVG <= 41 ug/L all year
EF1BChromium, hexavalent tot recoverableDAILY MX <= 120 ug/L all year
EF2BpHINST MIN >= 6 SU all year
EF2BpHINST MAX <= 9 SU all year
EF2BSolids, total suspendedMO AVG <= 30 mg/L all year
EF2BSolids, total suspendedWKLY AVG <= 45 mg/L all year
EF2BDurationTOTAL report only all year
EF2BFlow, in conduit or thru treatment plantDAILY AV report only all year
EF2BFlow, totalMO TOTAL report only all year
EF2BVolume, totalTOTAL report only all year
EF2BEnterococciGEO MEAN <= 290 CFU/100mL all year
EF2BEnterococci90TH % <= 1100 CFU/100mL all year
EF2BBOD, carbonaceous [5 day, 20 C]MO AVG <= 30 mg/L all year
EF2BBOD, carbonaceous [5 day, 20 C]WKLY AVG <= 45 mg/L all year
EF2BBOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
EF2BSolids, suspended percent removalMO AV MN >= 85 % all year
IN02BOD, 5-day, 20 deg. CMO AVG report only all year
IN02BOD, 5-day, 20 deg. CDAILY MX report only all year
IN02Solids, total suspendedMO AVG report only all year
IN02Solids, total suspendedDAILY MX report only all year
IN02Nitrogen, ammonia total [as N]MO AVG report only all year
IN02Nitrogen, ammonia total [as N]DAILY MX report only all year
IN02Nitrogen, ammonia total [as N]MO AVG report only all year
IN02Nitrogen, ammonia total [as N]DAILY MX report only all year
IN02Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
IN02Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
IN02Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
IN02Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
IN02Nitrite + Nitrate total [as N]MO AVG report only all year
IN02Nitrite + Nitrate total [as N]DAILY MX report only all year
IN02Nitrite + Nitrate total [as N]MO AVG report only all year
IN02Nitrite + Nitrate total [as N]DAILY MX report only all year
IN02Phosphorus, total [as P]MO AVG report only all year
IN02Phosphorus, total [as P]DAILY MX report only all year
IN02Phosphorus, total [as P]MO AVG report only all year
IN02Phosphorus, total [as P]DAILY MX report only all year
IN02Cyanide, total [as CN]DAILY MX report only all year
IN02Flow, in conduit or thru treatment plantDAILY AV report only all year
IN02Flow, totalMO TOTAL report only all year
IN03BOD, 5-day, 20 deg. CMO AVG report only all year
IN03BOD, 5-day, 20 deg. CDAILY MX report only all year
IN03Solids, total suspendedMO AVG report only all year
IN03Solids, total suspendedDAILY MX report only all year
IN03Nitrogen, ammonia total [as N]MO AVG report only all year
IN03Nitrogen, ammonia total [as N]DAILY MX report only all year
IN03Nitrogen, ammonia total [as N]MO AVG report only all year
IN03Nitrogen, ammonia total [as N]DAILY MX report only all year
IN03Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
IN03Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
IN03Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
IN03Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
IN03Nitrite + Nitrate total [as N]MO AVG report only all year
IN03Nitrite + Nitrate total [as N]DAILY MX report only all year
IN03Nitrite + Nitrate total [as N]MO AVG report only all year
IN03Nitrite + Nitrate total [as N]DAILY MX report only all year
IN03Phosphorus, total [as P]MO AVG report only all year
IN03Phosphorus, total [as P]DAILY MX report only all year
IN03Phosphorus, total [as P]MO AVG report only all year
IN03Phosphorus, total [as P]DAILY MX report only all year
IN03Cyanide, total [as CN]DAILY MX report only all year
IN03Flow, in conduit or thru treatment plantDAILY AV report only all year
IN03Flow, totalMO TOTAL report only all year
SUMMercury, total recoverableANNL AVG <= .23 kg/yr all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states